ui: the with-ui-running combinator can be removed

It was only used within the (with-ui) words which in turn were only
called by with-ui.

basis/ui/backend/cocoa/cocoa.factor

@@ -215,7 +215,6 @@ cocoa-startup-hook [
 
 M: cocoa-ui-backend (with-ui)
     "UI" assert.app [
-        [
         init-clipboard
         cocoa-startup-hook get call( -- )
         start-ui
@@ -223,7 +222,6 @@ M: cocoa-ui-backend (with-ui)
         init-thread-timer
         reset-thread-timer
         NSApp -> run
-        ] with-ui-running
     ] with-cocoa ;
 
 cocoa-ui-backend ui-backend set-global

basis/ui/backend/gtk/gtk.factor

@@ -503,7 +503,6 @@ M:: gtk-ui-backend system-alert ( caption text -- )
     ] with-destructors ;
 
 M: gtk-ui-backend (with-ui)
-    [
     f f gtk_init
     f f gtk_gl_init
     load-icon
@@ -511,8 +510,7 @@ M: gtk-ui-backend (with-ui)
     start-ui
     [
         [ [ gtk_main ] with-timer ] with-event-loop
-        ] with-destructors
-    ] with-ui-running ;
+    ] with-destructors ;
 
 M: gtk-ui-backend stop-event-loop
     gtk_main_quit ;

basis/ui/backend/windows/windows.factor

@@ -705,14 +705,12 @@ M: windows-ui-backend set-title ( string world -- )
     [ [ hWnd>> WM_SETTEXT 0 ] dip alien-address SendMessage drop ] bi ;
 
 M: windows-ui-backend (with-ui)
-    [
     [
         init-clipboard
         init-win32-ui
         start-ui
         event-loop
-        ] [ cleanup-win32-ui ] [ ] cleanup
-    ] with-ui-running ;
+    ] [ cleanup-win32-ui ] [ ] cleanup ;
 
 M: windows-ui-backend beep ( -- )
     0 MessageBeep drop ;

basis/ui/backend/x11/x11.factor

@@ -319,15 +319,13 @@ M: x11-handle flush-gl-context ( handle -- )
     dpy get swap window>> glXSwapBuffers ;
 
 M: x11-ui-backend (with-ui) ( quot -- )
-    [
     f [
         [
             init-clipboard
             start-ui
             event-loop
         ] with-xim
-        ] with-x
-    ] with-ui-running ;
+    ] with-x ;
 
 M: x11-ui-backend beep ( -- )
     dpy get 100 XBell drop ;

basis/ui/ui-docs.factor

@@ -3,7 +3,6 @@ math.rectangles namespaces quotations sequences strings ui.backend
 ui.gadgets ui.gadgets.books ui.gadgets.grids ui.gadgets.packs
 ui.gadgets.private ui.gadgets.tracks ui.gadgets.worlds ui.private ui.text
 vocabs.loader ;
-
 IN: ui
 
 HELP: close-window
@@ -91,7 +90,10 @@ HELP: raise-window
 
 HELP: with-ui
 { $values { "quot" { $quotation ( -- ) } } }
-{ $description "Calls the quotation, starting the UI if necessary. If starting the UI is necessary, this word does not return and the UI will start after the quotation returns." }
+{ $description
+  "Calls the quotation, starting the UI if necessary. If starting the UI is necessary, this word does not return and the UI will start after the quotation returns." $nl
+  "While the combinator is running, " { $link ui-running? } " can be used by user code to determine whether it is running in a UI context or not."
+}
 { $notes "This word should be used in the " { $link POSTPONE: MAIN: } " word of an application that uses the UI in order for the vocabulary to work when run from either the UI listener (" { $snippet "\"my-app\" run" } ") and the command line (" { $snippet "./factor -run=my-app" } ")." }
 { $examples "The " { $vocab-link "hello-ui" } " vocabulary implements a simple UI application which uses this word." } ;
 

basis/ui/ui.factor

@@ -134,10 +134,6 @@ M: world ungraft*
 
 SYMBOL: ui-running
 
-: with-ui-running ( quot -- )
-    t ui-running set-global
-    [ f ui-running set-global ] [ ] cleanup ; inline
-
 PRIVATE>
 
 : find-windows ( quot: ( world -- ? ) -- seq )
@@ -225,7 +221,11 @@ M: object resize-window 2drop ;
     [ find-world [ dup pref-dim resize-window ] when* ] bi ;
 
 : with-ui ( quot: ( -- ) -- )
-    ui-running? [ call( -- ) ] [ '[ init-ui @ ] (with-ui) ] if ;
+    ui-running? [ call( -- ) ] [
+        t ui-running set-global '[
+            [ init-ui @ ] (with-ui)
+        ] [ f ui-running set-global ] [ ] cleanup
+    ] if ;
 
 HOOK: beep ui-backend ( -- )